EP 1636797 A1 20060322 - OPTICAL DISC DRIVE APPARATUS
Title (en)
OPTICAL DISC DRIVE APPARATUS
Title (de)
OPTISCHES PLATTENLAUFWERKSGERÄT
Title (fr)
LECTEUR DE DISQUES OPTIQUES
Publication
Application
Priority
- IB 2004050808 W 20040528
- EP 03101697 A 20030611
- EP 04735310 A 20040528
Abstract (en)
[origin: WO2004109693A1] In an optical disc drive apparatus (1) capable of writing information to a recordable optical disc (2), a control circuit (10) for controlling an optical pickup unit (5) comprises: a controllable DC controller (22) adapted to give a DC offset to an analog data signal (RF); a variable gain amplifier (23) for amplifying the DC-shifted analog data signal (RFS); an AD-converter (24) for receiving the amplified analog signal (RFA); a digital calculating block (25) for receiving the digital output signal (RFD) 10 from the AD-converter (24) and digitally calculating at least one parameter (beta, m) indicative of write operation quality; a processor (26) for receiving said at least one quality indicating parameter (beta, m) and calculating a suitable power setting for the laser source of the optical pickup (5) on the basis of said at least one quality indicating parameter (beta, m).
IPC 1-7
IPC 8 full level
G11B 7/125 (2012.01)
CPC (source: EP KR US)
G11B 7/0045 (2013.01 - KR); G11B 7/1263 (2013.01 - KR); G11B 7/1267 (2013.01 - EP US)
Citation (search report)
See references of WO 2004109693A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2004109693 A1 20041216; CN 1802704 A 20060712; EP 1636797 A1 20060322; JP 2006527453 A 20061130; KR 20060019577 A 20060303; TW 200506883 A 20050216; US 2006126478 A1 20060615
DOCDB simple family (application)
IB 2004050808 W 20040528; CN 200480016021 A 20040528; EP 04735310 A 20040528; JP 2006516627 A 20040528; KR 20057023532 A 20051208; TW 93116441 A 20040608; US 55935505 A 20051206